I interpreted investment in the GP as meaning getting users to put their energy into a product. Like https://hbr.org/2014/11/how-customers-get-hooked-on-products
Were that the case then we'd only have one product in each market where, by your definition, the market would allow all but one to die out.
For what it is worth, I think you do need to make the product substantially better for people to check it out within a crowded market, but in a similar spirit to one of your other posts, there are multiple ways to distinguish your product (scaling, UI, feature set, etc.)